Please refer to the following Coinquest page ...
Please be aware of counterfeit coins
My picture is of a genuine dollar coin from a recent auction. Your coin may be genuine or fake. It looks genuine from your picture. You should get a precise weight (to the nearest 0.1 gram, see a jeweler).
Genuine dollar coins weigh 26 grams, and are 39 mm in diameter. Your coin's diameter is shy of 39 mm, and this (probably) means it is a 50 cent coin, not a dollar coin. Genuine 50 cent coins weigh 13.6 grams.
Below is the auction description for the dollar. The coin in my picture sold for $736 US dollars. If your coin is, in fact, 50 cents, the catalogs say it is worth more than the dollar coin.
Please write back once you have a precise weight. We may be able to get more info for you.
===== auction description of dollar coin =====
Roma Numismatics Ltd. > E-Sale 77 Auction date: 26 November 2020
Lot number: 1641
China, Empire. Guāngxù (Kuang-Hsü) AR 7 Mace 2 Candareens - Dollar. Tiānjīn Central (Tientsin) mint, undated issue, 1908. Emperor, denomination and mint in Hànzì and Manchu script / Flying Imperial dragon facing, coiled around fireball and surrounded by stylized clouds; inscription above, TAI - CHING - TI - KUO below. L Kann 216; KM (Yeoman) 14. 25.97g, 39mm, 12h.
Good Very Fine.
From the Professor Shir Mohammad Collection.
Estimate: 200 GBP